<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=<device-width>, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        const obj={
            name:'计涛',
            hobbies:['篮球','桌球']
        }
        Object.freeze(obj);// 让对象 浅层不可改变
        // 让obj不可以被改变
        obj.name= '123' ;
        obj.sex= '男' ;
        obj.hobbies.unshift('羽毛球')
        console.log(obj);
    </script>
</body>
</html>